I am often asked if a particular stadium has a "hot gun". The following is a list of corrections/offsets that we use in our data.

These #s use a rolling average of 10 games on either side; so, they are not yet nearly as precise at the very start of the season. Additionally, we use 55' (rather than the gameday standard 50') to compute velo, because it is a more accurate reflection of where the pitcher releases the ball.

For the following table, a negative mph number indicates a cool gun and a positive number indicates a hot gun.

You can also see that several stadiums have relatively large positive values for pfx_x, which indicates that movement is shifted right from the catcher's POV (or left, or negative numbers). Again, these are corrected out of the data displayed on the site.

Because these values change, these values reflect the current corrections applied on 07/23/2014. We also keep historical records on each game's offset for use on our cards and data system.
For more information, please contact dan@brooksbaseball.net

homemphpfx_xpfx_zx0z0axayazvx0vy0vz0
ana 0.338 -0.724 0.947 0.178 -0.036 -1.142 1.811 1.629 0.019 -0.504 -0.442
ari -0.082 0.343 -0.101 0.141 -0.098 0.617 -1.59 -0.179 -0.312 0.131 -0.406
atl -0.368 0.119 -0.422 0.064 -0.046 0.266 -2.006 -0.713 -0.24 0.529 0.123
bal -0.343 0.385 0.532 0.295 0.111 0.707 -0.944 0.845 -0.743 0.511 -0.261
bos 0.089 1.218 0.888 -0.068 -0.052 2.127 -0.368 1.53 -0.353 -0.132 -0.539
cha 0.394 -0.657 -0.182 0.165 -0.045 -1.073 1.54 -0.33 -0.002 -0.59 0.031
chn -0.42 -1.161 0.25 -0.279 -0.073 -1.997 -1.355 0.327 1.23 0.638 -0.068
cin -0.087 0.916 0.265 -0.093 0.063 1.634 -2.063 0.541 0.035 0.14 -0.51
cle -0.162 0.289 -0.687 0.079 0.005 0.469 -2.648 -1.086 -0.386 0.216 -0.014
col 0.422 1.669 -1.783 0.097 -0.055 2.938 -2.934 -3.093 -0.758 -0.671 0.625
det -0.039 -0.466 0.204 -0.01 -0.052 -0.795 -2.226 0.431 0.25 0.054 -0.335
flo -0.097 0.888 -0.152 -0.005 -0.154 1.526 -0.075 -0.208 -0.325 0.135 0.316
hou 0.148 2.268 0.413 0.258 -0.103 3.807 1.513 0.645 -1.309 -0.244 0.014
kca -0.262 -0.926 0.629 0.336 -0.139 -1.565 -0.341 0.964 -0.238 0.378 -0.109
lan 0.1 -0.963 0.038 0.083 -0.092 -1.683 0.675 0.006 0.287 -0.154 -0.017
mia -0.22 0.091 0.313 0.04 -0.002 0.18 1.315 0.51 0.094 0.342 -0.295
mil -0.464 0.233 -0.063 0.173 0.082 0.472 -0.493 -0.216 -0.434 0.673 -0.147
min 0.011 1.145 -0.199 0.064 0.041 2.045 -1.277 -0.389 -0.528 -0.035 -0.171
nya -0.263 -0.103 0.219 -0.059 -0.091 -0.107 -0.554 0.337 -0.321 0.366 -0.005
nyn 0.025 0.471 -1.372 -0.225 0.017 0.837 1.663 -2.32 0.325 -0.028 0.275
oak -0.65 0.343 -0.228 -0.031 -0.042 0.572 -2.19 -0.499 -0.249 0.938 -0.025
phi 0.501 -1.85 0.663 -0.169 0.058 -3.212 2.212 1.13 0.85 -0.688 -0.715
pit -0.319 0.894 -0.539 -0.069 -0.077 1.562 -0.607 -1 -0.031 0.457 0.415
sdn -0.419 1.416 -0.25 0.158 -0.127 2.423 -0.966 -0.48 -1.077 0.584 0.2
sea 0.284 -0.403 -4.211 -0.025 -0.326 -0.655 2.358 -7.35 0.08 -0.464 2.024
sfn 0.148 0.289 -0.554 -0.085 0.02 0.442 -0.843 -0.861 -0.233 -0.219 -0.102
sln -0.202 -1.266 -0.604 -0.061 -0.046 -2.166 0.543 -1.169 0.483 0.318 0.345
tba -0.458 2.702 0.421 0.031 -0.101 4.442 1.153 0.613 -0.898 0.644 0.127
tex -0.192 0.038 0.463 -0.04 0.094 0.084 -2.36 0.837 -0.251 0.283 -0.669
tor 0.396 -0.777 -0.509 0.107 -0.091 -1.319 0.782 -0.819 -0.334 -0.609 0.241
was -0.066 -0.944 -0.013 0.107 -0.02 -1.54 0.215 -0.09 0.342 0.111 -0.31